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Regulatory and Rate Matters - Integrated Resource Plan (Details) - meeting
 12 Months Ended
May 04, 2016
Jul. 01, 2014
Dec. 31, 2017
Jun. 30, 2016
NMPRC        
Public Utilities, General Disclosures [Line Items]        
Period of action plan     4 years  
Public Service Company of New Mexico        
Public Utilities, General Disclosures [Line Items]        
Required filing of Integrated Resource Plan     3 years  
Planning period covered, IRP     20 years  
Period of action plan     4 years  
Number of statewide meetings       17
Public Service Company of New Mexico | NMPRC        
Public Utilities, General Disclosures [Line Items]        
Period of action plan   4 years    
Period of time to show good cause why a docket should remain open 30 days